William h



(No Mddel. I I W'. H. HOWLAND.

MACHINE I'oR GRINDING ORES.

Patented July 12, 1881.

No.244,241.' I

I .D n IIIIIIIIIII I Y f l I C 1 j u L\ J a WITNESSES: IL INVENTOR:

ATTORNEYS.

N. PETERS: PhobLllho nphor. Wahlngmn, D. C.

UNITED STATES PATENT OFFICE.

W'ILLIAM H. HOWLAND, OF SAN FRANCISCO, CALIFORNIA.

MACHINE FOR GRIN DINGORE.

SPECIFICATION forming part of Letters Patent No. 244,241, dated July 12, 1881,

Application filed October 27, 1880. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM H. HOWLAND, of San Francisco, in the county of San Francisco and State of California, have invented a new anduseful Improvement in Machines for Grinding Ore, &c., of which the following is a specification.

My improvements relate to machines for grinding ore, either wet or dry, and for grinding paints and other materials. I make-use of a pan-shaped receptacle for the material, fitted with a ring-shaped bed, and fixed around a central shaft carrying the driver. The driver consists of a conical sleeve, to which the grinding-blocks are hung, so as to be thrown out centrifugally by rotation of the driver. A pipe supplies air or water within the driver, from which it passes to the grinding-surface, and acts to carry the ore or other material outward.

In the accompanying drawings, Figure 1 is aplan view of theimproved machine, the driver being broken open and the bonnet removed to show the interior. Fig. 2 is a vertical transverse section of the machine, and Fig. 3 is a side elevation of one grinding-block.

Similar letters of reference indicate correspouding parts.

A is a pan-shaped casting, which is to be supported on a suitable frame, and is formed with a central hub, a, through which the driving-shaft B extends, such shaft to be suitably stepped in the frame and driven in any desired manner.

0 is the screen-frame, fixed upon the rim of pan A, and flaring outward therefrom. This frame 0 is apertured to receive the screens shown at a, and upon the screen is fixed the bonnet 19, which, for wet grinding, will be in the form of a ring, as shown, but for dry grinding will be extended to the center, so as to inclose the pan. The grinding-surfaces are fitted within the pan, and consist of a ringshaped casting, c, at the bottom, and a cylindrical casting, e, that rests on ring 0 and against the inner sides of the pan.

D is the driver, formed as a cone-shaped sleeve, keyed to shaft B, and with its outer and lower end extending as nearly in contact as may be with the inner edge of the ring 0 and bottom of pan A. Upon the inner side of the driver three or more radial webs, d, are formed, which fit closely within the space between the sleeve and hub 44..

E are the grinding-blocks, four or more in number. These are of rectangular form in cross section, and curved lengthwise to fit snugly in the angle between ring 0 and cylinder 0. The driver D is formed on its lower portion with pins 0, on which are hung arms f, that are formed hook-shaped on their outer end for connection to apertured lugs g, formed on the inner sides of blocks E. By this connection the blocks are dragged by the driver, and are free to adapt themselves to the grinding-surfaces as they are thrown out by centrifugal action. The blocks E are each formed with two lugs, g, placed near the opposite ends, one above and the other below the center line horizontally, so that when one side of the block becomes worn it may be turned end for end and hung by the other lug to bring the other surfaces into use.

h is a pipe, passing along beneath the bot tom of pan A, and opening to theinside of the driver D, above the bottom, through the hub a, for supplying air or water, according as to whether the grinding is done wet or dry.

The base of the hollow driver D is perforated, as shown at '5, such perforations being in line with the upper surface of ring 0, so that the air or water shall pass out upon the grindingsurfaces and carry the ore or other material outward to the surface 0, and carry the finer particles through the screen.

In operation the ore is fed in through the aperture of bonnet 12 around the driver, and is crushed or ground by the action of blocks E. The rotation of the grinders tends to throw the broken ore upon the screens a, through which the finer particles escape, While the coarser fall back upon the grinding-surfaces.

This construction furnishes a durable ma chine, effective for grinding ore, and adapted for grinding paint materials and other substances.

The grinding is done principally upon the surface of the cylinder 0, the ring 0 serving as a support for the grinders.-

For some materials the grinding-surface will be preferably made of stone orwood.

Having thus fully described my invention,

I claim as new and desire to secure by Letters Patent 1. In a machine for ,gtrinding, ore, the combination, with the pan A, having central hub for drive-shaft, of the flaring bonneted frame 0, fixed upon the rim of said pan, and having the screens a, the ring-shaped grinder 0, the cylindrical grinder c, and the grinding-blocks E, the latter connected with driver by hooks and lugs, as described.

2. In an ore-grinder, the grinding-blocks E, made rectangular in cross-section, and provided with lugs g g near the opposite ends, one above and the other below a central hori-' zontal line, as and for the purpose specified.

3. In grinding-machines, the hollow driver D, formed with Webs d, and having perforations i, and air or Water pipe h, combined with pan A, provided with grinding-surfaces c 0, substantially as and for the purposes set forth. WILLIAM H. HOWLAND. Witnesses:

GEO. D. WALKER, O. Snnewrcrr. 

